A.  $\left\{\begin{array}{l}x=1+2t\\ y=3-t\\ z=-1\end{array}\right.$

B.  $\left\{\begin{array}{l}x=1+2t\\ y=-3+t\\ z=-1+t\end{array}\right.$

C.  $\left\{\begin{array}{l}x=1+2t\\ y=-3-t\\ z=-1+t\end{array}\right.$

D.  $\left\{\begin{array}{l}x=-1+2t\\ y=2+t\\ z=-2+t\end{array}\right.$

A.  $\left\{\begin{array}{l}x=1+2t\\ y=3-t\\ z=-1\end{array}\right.$

B.  $\left\{\begin{array}{l}x=1+2t\\ y=-3+t\\ z=-1+t\end{array}\right.$

C.  $\left\{\begin{array}{l}x=1+2t\\ y=-3-t\\ z=-1+t\end{array}\right.$

D.  $\left\{\begin{array}{l}x=-1+2t\\ y=2+t\\ z=-2+t\end{array}\right.$ 

A.  $\left\{\begin{array}{l}x=1+2t\\ y=3-t\\ z=-1\end{array}\right.$

B. $\left\{\begin{array}{l}x=1+2t\\ y=-3+t\\ z=-1+t\end{array}\right.$

C. $\left\{\begin{array}{l}x=1+2t\\ y=-3-t\\ z=-1+t\end{array}\right.$

D. $\left\{\begin{array}{l}x=-1+2t\\ y=2+t\\ z=-2+t\end{array}\right.$

A.  $\frac{x}{1}=\frac{y-1}{1}=\frac{z+1}{2}$

B.  $\frac{x}{1}=\frac{y-2}{-1}=\frac{z+2}{2}$

C.  $\frac{x}{1}=\frac{y-1}{-1}=\frac{z+1}{2}$

D.  $\frac{x-1}{1}=\frac{y-1}{-1}=\frac{z+1}{2}$

A. x+z+1=0

B. x+y+1=0

C. y+z+3=0

D. x+z-1=0

A. M = (0;–1;4)

B. M = (0;1;4)

C. M = (–3;2;0)

D. M = (3;0;5)